Comprising about 2-3% of the total white blood cells, which of the following resist infections and are also associated with allergic reactions?
1. | Eosinophils | 2. | Basophils |
3. | Monocytes | 4. | Lymphocytes |
A: | Left atrium has the thickest musculature in the human heart. |
B: | SA node is located in the wall of the right atrium. |
C: | Right ventricle pumps oxygenated blood into aorta. |
D: | Heart is covered by a double-layered pericardium. |
E: | Left atrium receives deoxygenated blood through pulmonary veins. |
Assertion (A): | Human heart is myogenic. |
Reason (R): | Human heart is made of cardiac muscle. |
1. | Both (A) and (R) are True and (R) correctly explains (A) |
2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
3. | (A) is True but (R) is False |
4. | (A) is False but (R) is True |
Which WBC has a large kidney-shaped nucleus, does not have granules in the cytoplasm, and after differentiation performs phagocytosis?
1. Neutrophil
2. Basophil
3. Lymphocyte
4. Monocyte
1. | The first heart sound (S1), also known as "lub," is produced by the closing of the semilunar valves at the beginning of systole. |
2. | The second heart sound (S2), also known as "dub," is produced by the closing of the atrioventricular valves at the end of systole. |
3. | The first heart sound (S1), also known as "lub," is produced by the closing of the atrioventricular valves at the beginning of systole. |
4. | The second heart sound (S2), also known as "dub," is produced by the reopening of the atrioventricular valves at the beginning of diastole. |
A: | Pulmonary circulation transports oxygen-rich blood from the heart to the rest of the body, while systemic circulation brings oxygen-poor blood back to the heart. |
B: | Pulmonary circulation carries oxygen-poor blood from the heart to the lungs and returns oxygen-rich blood back to the heart, while systemic circulation moves oxygen-rich blood from the heart to the body and returns oxygen-poor blood to the heart. |
In 100 mL of blood, what is the expected volume of plasma?
1. | 90 mL | 2. | 10 mL |
3. | 45 mL | 4. | 55 mL |
Assertion (A): | Erythroblastosis fetalis occurs when an Rh-negative mother carries an Rh-positive fetus. |
Reason (R): | The mother's immune system may produce antibodies against the Rh factor, which can cross the placenta and attack the fetal red blood cells. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
I: | The pulmonary circuit sends de-oxygenated blood to the lungs, while the systemic circuit circulates oxygenated blood to the rest of the body. |
II: | Double circulation includes two separate circuits for oxygenated and deoxygenated blood, which never mix. |
III: | In double circulation, blood passes twice through the heart in one complete cycle of the body. |